AUD_BufferReader.cpp

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/*
 * $Id: AUD_BufferReader.cpp 35141 2011-02-25 10:21:56Z jesterking $
 *
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * Copyright 2009-2011 Jörg Hermann Müller
 *
 * This file is part of AudaSpace.
 *
 * Audaspace is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * AudaSpace is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Audaspace; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "AUD_BufferReader.h"
#include "AUD_Buffer.h"
#include "AUD_Space.h"

AUD_BufferReader::AUD_BufferReader(AUD_Reference<AUD_Buffer> buffer,
                                                                   AUD_Specs specs) :
        m_position(0), m_buffer(buffer), m_specs(specs)
{
}

bool AUD_BufferReader::isSeekable() const
{
        return true;
}

void AUD_BufferReader::seek(int position)
{
        m_position = position;
}

int AUD_BufferReader::getLength() const
{
        return m_buffer.get()->getSize() / AUD_SAMPLE_SIZE(m_specs);
}

int AUD_BufferReader::getPosition() const
{
        return m_position;
}

AUD_Specs AUD_BufferReader::getSpecs() const
{
        return m_specs;
}

void AUD_BufferReader::read(int & length, sample_t* & buffer)
{
        int sample_size = AUD_SAMPLE_SIZE(m_specs);

        buffer = m_buffer.get()->getBuffer() + m_position * m_specs.channels;

        // in case the end of the buffer is reached
        if(m_buffer.get()->getSize() < (m_position + length) * sample_size)
                length = m_buffer.get()->getSize() / sample_size - m_position;

        if(length < 0)
                length = 0;
        m_position += length;
}